CMAS stands for Commercial Mobile Alert System, which is a program launched in the United States in 2006 by executive order and has since been renamed WEA or Wireless Emergency Alerts. It is part of a large-scale emergency alert system that can send messages to almost everyones cell phone at the same time, mainly for public safety reasons. CMAS enables government officials to target emergency alerts to specific geographic areas through cell towers, which pushes the information to dedicated receivers in CMAS-enabled mobile devices. Consumer Cellular is a mobile virtual network operator (MVNO) that runs on AT&T and T-Mobile networks, and CMAS is an important technology that can quite literally be a lifesaver. CMAS-enabled mobile phones will ensure that emergency warnings will not get stuck in large congested regions, and during any emergency, users of CMAS will get instant mobile texting and voice services. If you see a triangle with an exclamation mark inside, it means that you have received a CMAS message.